OfiTE 900 - Page 18

Patent No. 6,766,028 - OFI Testing Equipment, Inc.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 17
4. As the calibration proceeds, the software will begin to display the
collected data in the chart. At the end of the calibration, the software
will calculate the “r^2” value, which measures the accuracy of the
calibration. If this value is less than 0.9990, recalibrate the unit. If
this value is still low, change the lower bearing (see page 40 for
instructions) and try the calibration again. If the unit still does not
calibrate, it will require servicing by an OFITE technician.
“S.S. Reference” - the ideal shear stress as calculated by the software
“S.S. Raw” - the actual signal coming from the unit
“RPM” - rotational speed
“Viscosity Reference” - the ideal viscosity of the sample as calculated
by the software
“Temp” - the temperature of the sample at the time viscosity was
measured
“S.S. Best Fit” - shear stress value demonstrated by the viscometer
“Viscosity Best Fit” - viscosity value demonstrated by the viscometer
“S.S. Fit Error” - deviation of actual shear stress from “S.S. Best Fit”
“r^2” - This is a measure of the accuracy of the calibration. It will be
calculated at the end of the calibration cycle. If this value does not read
greater than 0.9990 after multiple calibration tests, the unit will require
servicing or new bearings.
“r^2C” - This value is not used on the Model 900 and should be ignored.
“Temperature” - the temperature of the sample
“Shear Rate” - rotational speed (1/s)
“RPM” - rotational speed (RPM)
“Shear Stress Raw” - the actual signal coming from the unit
“Ref Viscosity” - the ideal viscosity of the sample as calculated by the
software
“Ref Shear Stress” - the ideal shear stress as calculated by the software